United States Department of Transportation
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NAVSTAR GPS Simulation and Analysis Program [Interim Report]
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1983-10-01
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[PDF-3.40 MB]
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Abstract:This study assesses the capability of the planned NAVSTAR Global Positioning System (GPS) to meet civil navigation requirements. When it becomes operational in about 1983, NAVSTAR GPS will provide accurate two-dimensional and three-dimensional service to a wide spectrum of users. The quality of the service will depend on the availability of the satellite signals, the satellite geometrics, the timing accuracy of the signal, and the user receiver design. In this study ten specific issues are identified which have not yet been resolved. These issues provide the focus for the effort. First, air, marine and land requirements are cited. Next, the approach is described, whereby a combination of analysis and receiver simulation is used to address the issues. Receiver design alternatives are then discussed, focusing on the resulting GDOP distributions. Outages caused by poor satellite geometries are described, and some preliminary estimates given for the ability of receivers to "coast" through them. The effects of Selective Availability (reduced accuracy) are then analyzed. Differential operation is treated in some detail. The effects of ionospheric and tropospheric delays are estimated. It is shown that differential operation can provide excellent reduction in bias errors over a considerable region. Finally, costs are estimated for single- and dual-channel user receivers for the next 20 years.
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